Water ski



FIG. 1 is a top plan view of a water ski showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a top perspective view thereof.

The ornamental design for a water ski, as shown and described. 